Bath for ungumming silk and silk-wastes.



UNITED STATES PATENT OFFTCE.

PETER SCHMID AND KARL GROSS, F BASEL, SWITZERLAND; SAID GROSS ASSIGNOR 'IO SAID SCHMID.

BATH FOR UNG-UMMING SILK AND SILK-WASTES.

No Drawing.

T 0 all whom it may concern Be it known that we, PETER SOHMID, a citizen of the Swiss Republic, and KARL GRoss, a subject of the King of Prussia,

both residents of Basel, Switzerland, have invented a new Bath for Ungumming Silk and Silk-\Vastes, of which the following is a full, clear, and exact specification.

It is known that the ungumming of silk and silk wastes in all forms, as raw goods, spuns or tissues, that is to say the freeing of the said products from the sericin, is obtained by holding the goods for a certain time in boiling soap water or in soap lather produced by heating soap water with steam and that the quantity of soap necessary for this operation is considerable and, when a liquid soap water bath is employed, amounts to etO per cent. of the weight of the treated silk or silk wastes, and, when a lather bath is employed, 20 to 30 per cent. of the weight of the treated silk or silk wastes. We have ascertained, that the mentioned proportion of soap to employ is necessary and cannot be changed, if a well ungummed product is to be obtained. The soap employed must be very good and is expensive. Various substances, which have been tried as substitutes for a part of the soap, are either noxious or L00 expensive, and the problem to find an ungnmming agent cheaper than soap has not been solved heretofore.

We have found that silkworm-chrysalises or silk wastes containing silkwormchrysalises are good and cheap substitutes for a part of the soap used for ungumming silk and that this substitutehas the important advantage of reducing the alkalinity of the soapy bath.

The object of the present invention is therefore a bath for unguinming silk and Specification of Letters Patent.

Patented Sept. 26, 1916.

Application filed October 7, 1915. Serial No. 54,498.

silk wastes, in which the soap hitherto used is partially, and that to the extent of from to 95 per cent., replaced by silkwormchrysalises or silk wastes containing silkworm-chrysalises.

An efiicacious ungumming bath, which can be employed in liquid form or in form of froth or foam, can be produced, by using for the preparation of the bath about 5 to 6 parts soap and 5 to 4E parts silkWorm-chrysalises or bassinets (Italian gallettamim', French palettes) instead of the 10 parts soap which would have been used heretofore for the preparation of an ungumming bath of the same Volume.

The chemical composition of silkwormchrysalises or of bassinets is such that with the above indicated proportions the ungumming bath has lost nearly all alkalinity. Consequently the silks are less attacked in the ungumming and more easily freed from alkalinity by their subsequent washing.

YVhat we claim is:

l. A bath for ungumming silk and silk wastes, comprising a watery solution of to 6 parts soap and 9% to 4 parts silkwormchrysalisesf 2. A bath for ungumining silk and silk wastes, comprising a watery solution of to 6 parts soap and 9% to 4 parts silk waste contained silkworm chrysalises.

In witness whereof we have hereunto signed our names this 14th day of September, 1915, in the presence of two subscribing witnesses.

PETER SGHMID. KARL GROSS.

Witnesses ARNOLD ZUBER, AMAND BITTER.

; Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. 2 Washington. .D. G. 

